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Functionalized Self-Assembled Monolayers: Versatile Strategies to Combat Bacterial Biofilm Formation. Pharmaceutics 2022; 14:pharmaceutics14081613. [PMID: 36015238 PMCID: PMC9415113 DOI: 10.3390/pharmaceutics14081613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/29/2022] [Accepted: 07/30/2022] [Indexed: 11/16/2022] Open
Abstract
Bacterial infections due to biofilms account for up to 80% of bacterial infections in humans. With the increased use of antibiotic treatments, indwelling medical devices, disinfectants, and longer hospital stays, antibiotic resistant infections are sharply increasing. Annual deaths are predicted to outpace cancer and diabetes combined by 2050. In the past two decades, both chemical and physical strategies have arisen to combat biofilm formation on surfaces. One such promising chemical strategy is the formation of a self-assembled monolayer (SAM), due to its small layer thickness, strong covalent bonds, typically facile synthesis, and versatility. With the goal of combating biofilm formation, the SAM could be used to tether an antibacterial agent such as a small-molecule antibiotic, nanoparticle, peptide, or polymer to the surface, and limit the agent’s release into its environment. This review focuses on the use of SAMs to inhibit biofilm formation, both on their own and by covalent grafting of a biocidal agent, with the potential to be used in indwelling medical devices. We conclude with our perspectives on ongoing challenges and future directions for this field.
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2
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Ren Y, Zhou H, Lu J, Huang S, Zhu H, Li L. Theoretical and Experimental Optimization of the Graft Density of Functionalized Anti-Biofouling Surfaces by Cationic Brushes. MEMBRANES 2020; 10:membranes10120431. [PMID: 33348625 PMCID: PMC7766574 DOI: 10.3390/membranes10120431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/14/2020] [Accepted: 12/14/2020] [Indexed: 11/30/2022]
Abstract
Diseases and complications related to catheter materials are severe problems in biomedical material applications, increasing the infection risk and medical expenses. Therefore, there is an enormous demand for catheter materials with antibacterial and antifouling properties. Considering this, in this work, we developed an approach of constructing antibacterial surfaces on polyurethane (PU) via surface-initiated atom transfer radical polymerization (SI-ATRP). A variety of cationic polymers were grafted on PU. The biocompatibility and antifouling properties of all resulting materials were evaluated and compared. We also used a theoretical algorithm to investigate the anticoagulant mechanism of our PU-based grafts. The hemocompatibility and anti-biofouling performance improved at a 86–112 μg/cm2 grafting density. The theoretical simulation demonstrated that the in vivo anti-fouling performance and optimal biocompatibility of our PU-based materials could be achieved at a 20% grafting degree. We also discuss the mechanism responsible for the hemocompatibility of the cationic brushes fabricated in this work. The results reported in this paper provide insights and novel ideas on material design for applications related to medical catheters.
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Affiliation(s)
- Yijie Ren
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, No. 1 Wenyuan Road, Nanjing 210023, China
| | - Hongxia Zhou
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
| | - Jin Lu
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
| | - Sicheng Huang
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
| | - Haomiao Zhu
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, No. 1 Wenyuan Road, Nanjing 210023, China
- Correspondence: (H.Z.); (L.L.)
| | - Li Li
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China; (Y.R.); (H.Z.); (J.L.); (S.H.)
- School of Chemistry and Materials Science, Nanjing Normal University, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, No. 1 Wenyuan Road, Nanjing 210023, China
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, No. 1 Wenyuan Road, Nanjing 210023, China
- Correspondence: (H.Z.); (L.L.)
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3
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Prévost V, Anselme K, Gallet O, Hindié M, Petithory T, Valentin J, Veuillet M, Ploux L. Real-Time Imaging of Bacteria/Osteoblast Dynamic Coculture on Bone Implant Material in an in Vitro Postoperative Contamination Model. ACS Biomater Sci Eng 2019; 5:3260-3269. [PMID: 33405569 DOI: 10.1021/acsbiomaterials.9b00050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biomedical implants are an important part of evolving modern medicine but have a potential drawback in the form of postoperative pathogenic infection. Accordingly, the "race for surface" combat between invasive bacteria and host cells determines the fate of implants. Hence, proper in vitro systems are required to assess effective strategies to avoid infection. In this study, we developed a real time observation model, mimicking postoperative contamination, designed to follow E. coli proliferation on a titanium surface occupied by human osteoblastic progenitor cells (STRO). This model allowed us to monitor E. coli invasion of human cells on titanium surfaces coated and uncoated with fibronectin. We showed that the surface colonization of bacteria is significantly enhanced on fibronectin coated surfaces irrespective of whether areas were uncovered or covered with human cells. We further revealed that bacterial colonization of the titanium surfaces is enhanced in coculture with STRO cells. Finally, this coculture system provides a comprehensive system to describe in vitro and in situ bacterial and human cells and their localization but also to target biological mechanisms involved in adhesion as well as in interactions with surfaces, thanks to fluorescent labeling. This system is thus an efficient method for studies related to the design and function of new biomaterials.
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Affiliation(s)
- Victor Prévost
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France.,Université de Cergy-Pontoise, ERRMECe, F-95000 Neuville-sur-Oise, France
| | - Karine Anselme
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France
| | - Olivier Gallet
- Université de Cergy-Pontoise, ERRMECe, F-95000 Neuville-sur-Oise, France
| | - Mathilde Hindié
- Université de Cergy-Pontoise, ERRMECe, F-95000 Neuville-sur-Oise, France
| | - Tatiana Petithory
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France
| | - Jules Valentin
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France
| | - Mathieu Veuillet
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France
| | - Lydie Ploux
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.,Université de Strasbourg, F-67000 Strasbourg, France.,Université de Strasbourg, INSERM, BIOMAT U1121, F-67000 Strasbourg, France
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4
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Gordon V, Bakhtiari L, Kovach K. From molecules to multispecies ecosystems: the roles of structure in bacterial biofilms. Phys Biol 2019; 16:041001. [PMID: 30913545 DOI: 10.1088/1478-3975/ab1384] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Biofilms are communities of sessile microbes that are bound to each other by a matrix made of biopolymers and proteins. Spatial structure is present in biofilms on many lengthscales. These range from the nanometer scale of molecular motifs to the hundred-micron scale of multicellular aggregates. Spatial structure is a physical property that impacts the biology of biofilms in many ways. The molecular structure of matrix components controls their interaction with each other (thereby impacting biofilm mechanics) and with diffusing molecules such as antibiotics and immune factors (thereby impacting antibiotic tolerance and evasion of the immune system). The size and structure of multicellular aggregates, combined with microbial consumption of growth substrate, give rise to differentiated microenvironments with different patterns of metabolism and gene expression. Spatial association of more than one species can benefit one or both species, while distances between species can both determine and result from the transport of diffusible factors between species. Thus, a widespread theme in the biological importance of spatial structure in biofilms is the effect of structure on transport. We survey what is known about this and other effects of spatial structure in biofilms, from molecules up to multispecies ecosystems. We conclude with an overview of what experimental approaches have been developed to control spatial structure in biofilms and how these and other experiments can be complemented with computational work.
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Affiliation(s)
- Vernita Gordon
- Department of Physics, University of Texas at Austin, Austin TX 78712, United States of America. Center for Nonlinear Dynamics, University of Texas at Austin, Austin TX 78712, United States of America. Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin TX 78712, United States of America. Author to whom any correspondence should be addressed
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5
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Chi C, Sun B, Zhou N, Zhang M, Chu X, Yuan P, Shen J. Anticoagulant polyurethane substrates modified with poly(2-methacryloyloxyethyl phosphorylcholine) via SI-RATRP. Colloids Surf B Biointerfaces 2018; 163:301-308. [PMID: 29329075 DOI: 10.1016/j.colsurfb.2018.01.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 12/31/2017] [Accepted: 01/06/2018] [Indexed: 12/24/2022]
Affiliation(s)
- Cheng Chi
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China
| | - Baohong Sun
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China
| | - Ninglin Zhou
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China; Nanjing Zhou Ninglin Advanced Materials Technology Company Limited, Nanjing 211505, China.
| | - Ming Zhang
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China
| | - Xiaohong Chu
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China
| | - Ping Yuan
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China
| | - Jian Shen
- Jiangsu Collaborative Innovation Center for Biological Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Engineering Research Center for Biomedical Function Materials, Nanjing 210023, China.
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6
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Böhmler J, Haidara H, Ponche A, Ploux L. Impact of Chemical Heterogeneities of Surfaces on Colonization by Bacteria. ACS Biomater Sci Eng 2015; 1:693-704. [DOI: 10.1021/acsbiomaterials.5b00151] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Judith Böhmler
- Institut
de Science des Matériaux
de Mulhouse, CNRS-UMR7361, University of Strasbourg/University of Haute-Alsace, UMR7361, Mulhouse, France
| | - Hamidou Haidara
- Institut
de Science des Matériaux
de Mulhouse, CNRS-UMR7361, University of Strasbourg/University of Haute-Alsace, UMR7361, Mulhouse, France
| | - Arnaud Ponche
- Institut
de Science des Matériaux
de Mulhouse, CNRS-UMR7361, University of Strasbourg/University of Haute-Alsace, UMR7361, Mulhouse, France
| | - Lydie Ploux
- Institut
de Science des Matériaux
de Mulhouse, CNRS-UMR7361, University of Strasbourg/University of Haute-Alsace, UMR7361, Mulhouse, France
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7
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Böhmler J, Ponche A, Anselme K, Ploux L. Self-assembled molecular platforms for bacteria/material biointerface studies: importance to control functional group accessibility. ACS APPLIED MATERIALS & INTERFACES 2013; 5:10478-10488. [PMID: 24107186 DOI: 10.1021/am401976g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Highly controlled mixed molecular layers are crucial to study the role of material surface chemistry in biointerfaces, such as bacteria and subsequent biofilms interacting with biomaterials. Silanes with non-nucleophilic functional groups are promising to form self-assembled monolayers (SAMs) due to their low sensitivity to side-reactions. Nevertheless, the real control of surface chemistry, layer structure, and organization has not been determined. Here, we report a comprehensive synthesis and analysis of undecyltrichlorosilane- and 11-bromoundecyltrichlorosilane-based mixed SAMs on silicon substrates. The impact of the experimental conditions on the control of surface chemistry, layer structure, and organization was investigated by combining survey and high-resolution X-ray photoelectron spectroscopy analysis, wettability measurements, and ellipsometry. The most appropriate conditions were first determined for elaborating highly reproducible, but easily made, pure 11-bromoundecyltrichlorosilane SAMs. We have demonstrated that the control is maintained on more complex surfaces, i.e., surfaces revealing various chemical densities, which were obtained with different ratios of undecyltrichlorosilane and 11-bromoundecyltrichlorosilane. The control is also maintained after bromine to amine group conversion via SN2 bromine-to-azide reactions. The appropriateness of such highly controlled amino- and methyl-group revealing platforms (NH2-X%/CH3) for biointerface studies was shown by the higher reproducibility of bacterial adhesion on NH2-100%/CH3 SAMs compared to bacterial adhesion on molecular layers of overall similar surface chemistry but less control at the molecular scale.
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Affiliation(s)
- Judith Böhmler
- Institut of Materials Science of Mulhouse (CNRS UMR7361), Mulhouse, France
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8
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Gu H, Hou S, Yongyat C, De Tore S, Ren D. Patterned biofilm formation reveals a mechanism for structural heterogeneity in bacterial biofilms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11145-11153. [PMID: 23919925 DOI: 10.1021/la402608z] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Bacterial biofilms are ubiquitous and are the major cause of chronic infections in humans and persistent biofouling in industry. Despite the significance of bacterial biofilms, the mechanism of biofilm formation and associated drug tolerance is still not fully understood. A major challenge in biofilm research is the intrinsic heterogeneity in the biofilm structure, which leads to temporal and spatial variation in cell density and gene expression. To understand and control such structural heterogeneity, surfaces with patterned functional alkanthiols were used in this study to obtain Escherichia coli cell clusters with systematically varied cluster size and distance between clusters. The results from quantitative imaging analysis revealed an interesting phenomenon in which multicellular connections can be formed between cell clusters depending on the size of interacting clusters and the distance between them. In addition, significant differences in patterned biofilm formation were observed between wild-type E. coli RP437 and some of its isogenic mutants, indicating that certain cellular and genetic factors are involved in interactions among cell clusters. In particular, autoinducer-2-mediated quorum sensing was found to be important. Collectively, these results provide missing information that links cell-to-cell signaling and interaction among cell clusters to the structural organization of bacterial biofilms.
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Affiliation(s)
- Huan Gu
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, USA
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9
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Sun K, Xie Y, Ye D, Zhao Y, Cui Y, Long F, Zhang W, Jiang X. Mussel-inspired anchoring for patterning cells using polydopamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2131-2136. [PMID: 22085048 DOI: 10.1021/la2041967] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This Article introduces a simple method of cell patterning, inspired by the mussel anchoring protein. Polydopamine (PDA), artificial polymers made from self-polymerization of dopamine (a molecule that resembles mussel-adhesive proteins), has recently been studied for its ability to make modifications on surfaces in aqueous solutions. We explored the interfacial interaction between PDA and poly(ethylene glycol) (PEG) using microcontact printing (μCP). We patterned PDA on several substrates such as glass, polystyrene, and poly(dimethylsiloxane) and realized spatially defined anchoring of mammalian cells as well as bacteria. We applied our system in investigating the relationship between areas of mammalian nuclei and that of the cells. The combination of PDA and PEG enables us to make cell patterns on common laboratorial materials in a mild and convenient fashion.
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Affiliation(s)
- Kang Sun
- Key Lab for Biological Effects of Nanomaterials and Nanosafety, National Center for NanoScience and Technology, Beijing 100080, China
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10
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Pei J, Hall H, Spencer ND. The role of plasma proteins in cell adhesion to PEG surface-density-gradient-modified titanium oxide. Biomaterials 2011; 32:8968-78. [DOI: 10.1016/j.biomaterials.2011.08.034] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 08/10/2011] [Indexed: 01/03/2023]
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11
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Quantitative evaluation of bacteria adherent and in biofilm on single-wall carbon nanotube-coated surfaces. Interdiscip Perspect Infect Dis 2011; 2011:291513. [PMID: 22007207 PMCID: PMC3189608 DOI: 10.1155/2011/291513] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 07/07/2011] [Accepted: 08/11/2011] [Indexed: 11/30/2022] Open
Abstract
Biofilm is a common bacterial lifestyle, and it plays a crucial role in human health, causing biofilm-mediated infections. Recently, to counteract biofilm development, new nano-structured biomaterials have been proposed. However, data about the antibacterial properties of nano-structured surfaces are fragmentary and controversial, and, in particular, the susceptibility of nano-structured materials to colonization and biofilm formation by bacterial pathogens has not been yet thoroughly considered. Here, the ability of the pathogenic Streptococcus mutans and Pseudomonas aeruginosa to adhere and form biofilm on surfaces coated with single-wall carbon nanotubes (SWCNTs) was analyzed. Our results showed that the surfaces of SWCNTs-coated glass beads (SWCNTs-GBs) were colonized at the same extent of uncoated GBs both by S. mutans and P. aeruginosa. In conclusion, our results demonstrate that single wall SWCNTs-coated surfaces are not suitable to counteract bacterial adhesion and biofilm development.
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12
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Pedron S, Peinado C, Catalina F, Bosch P, Anseth KS, Abrusci C. Combinatorial approach for fabrication of coatings to control bacterial adhesion. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2011; 23:1613-28. [PMID: 21888758 DOI: 10.1163/092050611x589329] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Due to the high importance of bacterial infections in medical devices there is an increasing interest in the design of anti-fouling coatings. The application of substrates with controlled chemical gradients to prevent microbial adhesion is presented. We describe here the co-polymerization of poly(ethylene glycol) dimethacrylate with a hyperbranched multimethacrylate (H30MA) using a chemical gradient generator; and the resulting films were characterized with respect to their ability to serve as coating for biomedical devices. The photo-polymerized materials present special surface properties due to the hyperbranched structure of H30MA and phase separation at specific concentrations in the PEGDM matrix. This approach affords the investigation of cell response to a large range of different chemistries on a single sample. Two bacterial strains commonly associated with surgical site infections, Escherichia coli and Pseudomonas aeruginosa, have been cultured on these substrates to study their attachment behaviour. These gradient-coated samples demonstrate less bacterial adhesion at higher concentrations of H30MA, and the adhesion is substantially affected by the extent of surface phase segregation.
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Affiliation(s)
- S Pedron
- a Institute de Ciencia y Tecnología de Polímeros, CSIC , Juan de la Cierva 3 , 28006 , Madrid , Spain
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13
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Developing a self-assembled monolayer microarray to study stem cell differentiation. J Colloid Interface Sci 2011; 360:325-30. [DOI: 10.1016/j.jcis.2011.04.098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 04/26/2011] [Accepted: 04/27/2011] [Indexed: 01/17/2023]
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14
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Lopez AI, Kumar A, Planas MR, Li Y, Nguyen TV, Cai C. Biofunctionalization of silicone polymers using poly(amidoamine) dendrimers and a mannose derivative for prolonged interference against pathogen colonization. Biomaterials 2011; 32:4336-46. [PMID: 21435713 PMCID: PMC3085595 DOI: 10.1016/j.biomaterials.2011.02.056] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Accepted: 02/27/2011] [Indexed: 01/01/2023]
Abstract
Despite numerous preventive strategies on bacterial adhesion, pathogenic biofilm formation remained the major cause of medical device-related infections. Bacterial interference is a promising strategy that uses pre-established biofilms of benign bacteria to serve as live, protective coating against pathogen colonization. However, the application of this strategy to silicone urinary catheters was hampered by low adherence of benign bacteria onto silicone materials. In this work, we present a general method for biofunctionalization of silicone (PDMS) as one of the most widely used materials for biomedical devices. We used mild CO(2) plasma to activate PDMS surface followed by simple attachment of generation 5 (G5) poly(amidoamine) (PAMAM) dendrimers to generate an amino-terminated surface that were maintained even after storage in PBS buffer for 36 days. We then covalently attach a carboxy-terminated mannose derivative to the modified PDMS to promote the adherence of benign Escherichia coli 83972 expressing mannose-binding type 1 fimbriae. We demonstrated that dense, stable biofilms of E. coli 83972 could be established within 48 h on the mannose-coated PDMS. Significantly, this benign biofilm reduced the adherence of the uropathogenic Enterococcus faecalis by 104-fold after 72 h, while the benign bacteria on the unmodified substrate by only 5.5-fold.
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Affiliation(s)
- Analette I. Lopez
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Amit Kumar
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Megan R. Planas
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Yan Li
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Thuy V. Nguyen
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Chengzhi Cai
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
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15
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Bandyopadhyay D, Prashar D, Luk YY. Anti-fouling chemistry of chiral monolayers: enhancing biofilm resistance on racemic surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6124-6131. [PMID: 21486002 DOI: 10.1021/la200230t] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work reports the resistance to protein adsorption and bacterial biofilm formation by chiral monolayers of polyol-terminated alkanethiols surrounding micrometer-sized patterns of methyl-terminated alkanethiols on gold films. We discover that patterned surfaces surrounded by chiral polyol monolayers can distinguish different stages of biofilm formation. After inoculation on the surfaces, bacteria first reversibly attached on the chiral polyol monolayers. Over time, the bacteria detached from the polyol surfaces, and attached on the hydrophobic micropatterns to form biofilms. Interestingly, while both enantiomers of gulitol- and mannonamide-terminated monolayer resisted adsorption of proteins (bovine serum albumin, lysozyme, and fibrinogen) and confined biofilms formed on the micropatterns, the monolayers formed by the racemic mixture of either pair of enantiomers exhibited stronger antifouling chemistry against both protein adsorption and biofilm formation than monolayers formed by one enantiomer alone. These results reveal the different chemistries that separate the different stages of biofilm formation, and the stereochemical influence on resisting biofoulings at a molecular-level.
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Affiliation(s)
- Debjyoti Bandyopadhyay
- Department of Chemistry, Syracuse University, Syracuse, New York 13244-4100, United States
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Abstract
This article reviews the physical and chemical constraints of environments on biofilm formation. We provide a perspective on how materials science and engineering can address fundamental questions and unmet technological challenges in this area of microbiology, such as biofilm prevention. Specifically, we discuss three factors that impact the development and organization of bacterial communities. (1) Physical properties of surfaces regulate cell attachment and physiology and affect early stages of biofilm formation. (2) Chemical properties influence the adhesion of cells to surfaces and their development into biofilms and communities. (3) Chemical communication between cells attenuates growth and influences the organization of communities. Mechanisms of spatial and temporal confinement control the dimensions of communities and the diffusion path length for chemical communication between biofilms, which, in turn, influences biofilm phenotypes. Armed with a detailed understanding of biofilm formation, researchers are applying the tools and techniques of materials science and engineering to revolutionize the study and control of bacterial communities growing at interfaces.
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Hou S, Gu H, Smith C, Ren D. Microtopographic patterns affect Escherichia coli biofilm formation on poly(dimethylsiloxane) surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:2686-2691. [PMID: 21319846 DOI: 10.1021/la1046194] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Biofilms are involved in 80% of human bacterial infections and are up to 1000 times more tolerant to antibiotics than their planktonic counterparts. To better understand the mechanism of bacteria-surface interactions, polydimethylsiloxane (PDMS) surfaces with microtopographic patterns were tested to study the effects of surface topography on bacterial adhesion and biofilm formation. The patterned PDMS surfaces were prepared by transferring complementary surface topography from a silicon wafer etched via photolithography to introduce 10 μm tall square-shape features. The dimension of protruding square features and the distance between adjacent features were systematically varied. Escherichia coli RP437/pRSH103 (with constitutive expression of red fluorescent protein) was found to preferentially attach and form biofilms in valleys between protruding features even when the dimension of plateaus (top of the square features) is considerably larger than valleys. In addition, significant adhesion of E. coli on plateaus was only observed when the plateaus were bigger than 20 μm × 20 μm for face-up patterns and 40 μm × 40 μm for face-down patterns. This finding suggests that a threshold dimension may be essential for biofilm formation on flat surfaces without physical confinement.
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Affiliation(s)
- Shuyu Hou
- Department of Biomedical and Chemical Engineering, ‡Syracuse Biomaterials Institute, §Department of Civil and Environmental Engineering, and ⊥Department of Biology, Syracuse University , Syracuse, New York 13244, United States
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Bandyopadhyay D, Prashar D, Luk YY. Stereochemical effects of chiral monolayers on enhancing the resistance to mammalian cell adhesion. Chem Commun (Camb) 2011; 47:6165-7. [DOI: 10.1039/c1cc10855g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Qin G, Santos C, Zhang W, Li Y, Kumar A, Erasquin UJ, Liu K, Muradov P, Trautner BW, Cai C. Biofunctionalization on alkylated silicon substrate surfaces via "click" chemistry. J Am Chem Soc 2010; 132:16432-41. [PMID: 21033708 PMCID: PMC3059218 DOI: 10.1021/ja1025497] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Biofunctionalization of silicon substrates is important to the development of silicon-based biosensors and devices. Compared to conventional organosiloxane films on silicon oxide intermediate layers, organic monolayers directly bound to the nonoxidized silicon substrates via Si-C bonds enhance the sensitivity of detection and the stability against hydrolytic cleavage. Such monolayers presenting a high density of terminal alkynyl groups for bioconjugation via copper-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC, a "click" reaction) were reported. However, yields of the CuAAC reactions on these monolayer platforms were low. Also, the nonspecific adsorption of proteins on the resultant surfaces remained a major obstacle for many potential biological applications. Herein, we report a new type of "clickable" monolayers grown by selective, photoactivated surface hydrosilylation of α,ω-alkenynes, where the alkynyl terminal is protected with a trimethylgermanyl (TMG) group, on hydrogen-terminated silicon substrates. The TMG groups on the film are readily removed in aqueous solutions in the presence of Cu(I). Significantly, the degermanylation and the subsequent CuAAC reaction with various azides could be combined into a single step in good yields. Thus, oligo(ethylene glycol) (OEG) with an azido tag was attached to the TMG-alkyne surfaces, leading to OEG-terminated surfaces that reduced the nonspecific adsorption of protein (fibrinogen) by >98%. The CuAAC reaction could be performed in microarray format to generate arrays of mannose and biotin with varied densities on the protein-resistant OEG background. We also demonstrated that the monolayer platform could be functionalized with mannose for highly specific capturing of living targets (Escherichia coli expressing fimbriae) onto the silicon substrates.
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Díaz C, Salvarezza RC, Fernández Lorenzo de Mele MA, Schilardi PL. Organization of Pseudomonas fluorescens on chemically different nano/microstructured surfaces. ACS APPLIED MATERIALS & INTERFACES 2010; 2:2530-2539. [PMID: 20726529 DOI: 10.1021/am100313z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper describes bacterial organization on nano/micropatterned surfaces with different chemical properties, which show different interactions with the biological systems (inert, biocompatible, and bactericide). These surfaces were prepared by molding techniques and exposed to Pseudomonas fluorescens (P. fluorescens) cultures. Results from atomic force microscopy and optical imaging demonstrate that the structure of P. fluorescens aggregates is strongly dependent on the surface topography while there is no clear linking with the physical-chemical surface properties (charge and contact angle) of the substrate immersed in abiotic culture media. We observe that regardless of the material when the surface pattern matches the bacterial size, bacterial assemblages involved in surface colonization are disorganized. The fact there is not a relationship between surface chemistry and bacterial organization can be explained by the coverage of the surfaces by adsorbed organic species coming from the culture medium. Viability assays indicate that copper behaves as a toxic substrate despite the presence of adsorbed molecules. The combination of surface traps and biocidal activity could act synergistically as a suitable strategy to limit bacterial spreading on implant materials.
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Affiliation(s)
- Carolina Díaz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
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Beurer E, Venkataraman NV, Rossi A, Bachmann F, Engeli R, Spencer ND. Orthogonal, three-component, alkanethiol-based surface-chemical gradients on gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8392-8399. [PMID: 20166727 DOI: 10.1021/la904830h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An orthogonal surface-chemical gradient composed of self-assembled monolayers on gold has been prepared by successive, controlled immersions in orthogonal directions into dilute solutions of dodecanethiol and perfluorododecanethiol. The resulting two-component orthogonal gradient in surface coverage was backfilled with 11-mercaptoundecanol, leading to a two-directional, three-component surface-chemical gradient. Water and hexadecane show distinctly different wetting behaviors on the gradient surface because of the differences in the hydrophobic and oleophobic natures of the three different constituents. These results are correlated with the chemical composition maps of the surface obtained by X-ray photoelectron spectroscopy. The homogeneity and the ordering of the self-assembled monolayer were investigated by dynamic water contact angle measurements and polarization-modulation infrared reflection-absorption spectroscopy.
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Affiliation(s)
- Eva Beurer
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
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Effects of Trp- and Arg-containing antimicrobial-peptide structure on inhibition of Escherichia coli planktonic growth and biofilm formation. Appl Environ Microbiol 2010; 76:1967-74. [PMID: 20097816 DOI: 10.1128/aem.02321-09] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Biofilms are sessile microbial communities that cause serious chronic infections with high morbidity and mortality. In order to develop more effective approaches for biofilm control, a series of linear cationic antimicrobial peptides (AMPs) with various arginine (Arg or R) and tryptophan (Trp or W) repeats [(RW)(n)-NH(2), where n = 2, 3, or 4] were rigorously compared to correlate their structures with antimicrobial activities affecting the planktonic growth and biofilm formation of Escherichia coli. The chain length of AMPs appears to be important for inhibition of bacterial planktonic growth, since the hexameric and octameric peptides significantly inhibited E. coli growth, while tetrameric peptide did not cause noticeable inhibition. In addition, all AMPs except the tetrameric peptide significantly reduced E. coli biofilm surface coverage and the viability of biofilm cells, when added at inoculation. In addition to inhibition of biofilm formation, significant killing of biofilm cells was observed after a 3-hour treatment of preformed biofilms with hexameric peptide. Interestingly, treatment with the octameric peptide caused significant biofilm dispersion without apparent killing of biofilm cells that remained on the surface; e.g., the surface coverage was reduced by 91.5 + or - 3.5% by 200 microM octameric peptide. The detached biofilm cells, however, were effectively killed by this peptide. Overall, these results suggest that hexameric and octameric peptides are potent inhibitors of both bacterial planktonic growth and biofilm formation, while the octameric peptide can also disperse existing biofilms and kill the detached cells. These results are helpful for designing novel biofilm inhibitors and developing more effective therapeutic methods.
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Robertus J, Browne WR, Feringa BL. Dynamic control over cell adhesive properties using molecular-based surface engineering strategies. Chem Soc Rev 2010; 39:354-78. [DOI: 10.1039/b906608j] [Citation(s) in RCA: 194] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Wu J, Hou S, Ren D, Mather PT. Antimicrobial Properties of Nanostructured Hydrogel Webs Containing Silver. Biomacromolecules 2009; 10:2686-93. [DOI: 10.1021/bm900620w] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jian Wu
- Department of Biomedical and Chemical Engineering, Syracuse Biomaterials Institute, Department of Civil and Environmental Engineering, and Department of Biology, Syracuse University, Syracuse, New York 13244
| | - Shuyu Hou
- Department of Biomedical and Chemical Engineering, Syracuse Biomaterials Institute, Department of Civil and Environmental Engineering, and Department of Biology, Syracuse University, Syracuse, New York 13244
| | - Dacheng Ren
- Department of Biomedical and Chemical Engineering, Syracuse Biomaterials Institute, Department of Civil and Environmental Engineering, and Department of Biology, Syracuse University, Syracuse, New York 13244
| | - Patrick T. Mather
- Department of Biomedical and Chemical Engineering, Syracuse Biomaterials Institute, Department of Civil and Environmental Engineering, and Department of Biology, Syracuse University, Syracuse, New York 13244
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Ballav N, Thomas H, Winkler T, Terfort A, Zharnikov M. Making Protein Patterns by Writing in a Protein-Repelling Matrix. Angew Chem Int Ed Engl 2009; 48:5833-6. [DOI: 10.1002/anie.200900950] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Ballav N, Thomas H, Winkler T, Terfort A, Zharnikov M. Herstellung von Proteinmustern durch Schreiben in proteinabweisende Matrizen. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900950] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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